Heat exchanger



Patented Dec. 5, 1933 PATENT OFFICE 1,937,so2 HEAT EXCHANGER Alvin H.Baer, Waynesboro, Pa., assignor to Frick Company, Waynesboro, Pa., acorporation of Pennsylvania Application October 12.

4 Claims.

This invention relates to heat exchangers and its object is to providemeans for effecting a more rapid transfer of heat than with devices ofthis type heretofore known.

A further object is to provide means for circulating liquid refrigerantto bring it in more intimate contact with the fluid to be cooled toeffect more rapid heat transfer.

Referring to the `accompanying drawing, which is made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is a vertical section through the shell on the line l-l ofFigure 2,

Figure 2 a side elevation, and

Figure 3 a section on line 3-3 of Figure 2.

In the drawing numeral 10. indicates a shell preferably of steel of theusual type having end plates 11 and 12. End covers 13 and 14 are securedto the end plates as by bolts or rivets in the usual manner to provideheader chambers at each end of the shell. Longitudinal tubes 15 aresecured in the end plates and provide communication between the headerchambers. The chamber fat head 14 is divided by a partition wall 16.Ports 18 and 17 are provided in the head 14 and these ports areconnected through' suitable fluid lines with a source of fluid to becooled. Inclined baflie plates 19 are placed in the shell and soarranged as to direct liquid refrigerant toward the center of the shell.Inlet ports 20 are arranged to deliver liquid refrigerant into theshell. These ports are so arranged as to direct liquid beneath thebaflle plates 19. While the inlet nozzles 20 are shown at variouspositions as entering radially inwardly intoithe shell they may bearranged in other positions. For example, they might come through thetop of the shell and extend down inside, with the nozzles positioned atsuitable locations in the shell to direct the refrigerant in thedirection desired. An outlet manifold 21 having openings 24 in its uppersurface is connected to an outlet pipe 22 for drawing off the evaporatedrefrigerant.

In the operation the liquid refrigerant is delivered through pipes 23and inlet nozzles 20 into the shell 10 beneath the inclined baffle plate19. Such refrigerant Ias evaporates from the surface of the liquidwithin the shell is 1931. Serial No. 568,441

shell. This circulation will be greatly accelerated by the evaporationof a portion of the liquid to create in substance an air lift pump. Thewhole effect of this circulation will be to bring the liquid into moreintimate contact with the pipes 15 whichcontain the fluid to be cooled.The baflie plates 19 vmay'be arranged at any suitable angle so as tobring about the best circulation of the liquid within the shell. By theuse of this heat exchanger more rapid heat transfer is effected sincethe cold refrigerant is keptin constant circulation among the pipescontaining the fluid to be cooled. Any number of baffle plates may beprovided and likewise any number of refrigerant inlet ports 20 may bepro- 70 vided. Likewise the outlet pipe may be a simple pipe instead ofthe arrangement shown. IIlhe size of the shell and other operatingconditions will determine the number of baflle plates and the number ofinlet tubes necessary or desirable, the ultimate purpose being to securethe greatest amount of circulation obtainable in connection withefficient operation.

It will be obvious to 4those skilled in the art that various changes maybe made in my device Without departing from the spirit of the inventionand therefore I do not limit myself to what is shown in the drawing anddescribed in the specificaton, but only as indicated by the appendedclaims.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is: l

1. A heat exchanger comprising a shell having end plates secured to andclosing each end, ad-f ditional plates secured to said end plates so asto form fluid chambers at the ends of the shell, one of said chambershaving a partition therein dividing it into two compartments, a fluidinlet to one compartment and a fluid outlet from the other, a pluralityof tubes secured in the end plates and connecting the chambers at eachend `of the shell, dished baflle plates positioned within the shellhaving their ends secured to the end plates on the shell, said baflleplates being positioned so as to extend over a group of the said tubes,the bafie plates being open at their tops to permit circulation of fluidupwardly through the shell and between the said tubes, a plurality ofinlets for cooling fluid into the shell, and a suction positionedadjacent the top. of the shell for drawing off evaporated cooling fluid,Substantially as set forth.

2. A heat exchanger comprising a cylindrical shell having plates closingits ends, an additional lts plate secured at its edges to each of saidend plates so as to provide a chamber at each end of the shell, one ofsaid chambers having a partition dividing it into two compartments, aninlet for fluid to be cooled to one compartment and an outlet for saidfluid from the other compartment, a plurality of tubes secured in theend plates and forming communication between the chambers at each end ofthe shell, a pair of baffle lplates having their ends secured to the endplates, the plates being inclined upwardly toward the center of theshell and having their inner upper edges spaced from each other toprovide a channel for free circulation of fluid within the shell, saidbaflle plates being positioned above a group of tubes in the shell andmeans for supplving cooling fluid beneath the baffle plates, said meansbeing positionedrto direct the said cooling fluid toward the tubesbeneath the baflle plates, and a suction connection for drawing offvevaporated cooling fluid. from the shell, substantially asset forth.

3. A heat exchanger comprising a shell having its ends closed by platessecured thereto and having chambers formed at the ends of the shell, oneo`f said chambers being divided by a Y partition wall to form twocompartments, an inlet for fluid to be cooled to one compartment and anoutlet for said fluid from the other compartment, a plurality of tubesconnecting said chambers, a hood` formed of a pair of baifle platespositioned within said shell, said plates being secured at their ends tothe inner sides of the end plates on the shell, the hood having aplurality of said tubes positioned beneath it, a second similar hoodsimilarly placed within the shell and above the first named hood, eachof Las'zsoa said hoods having an opening at their upper sides to permitfree circulation of a cooling fluid through the shell and a plurality offluid nozzles positioned in the walls of the shell and directed so as todeliver cooling fluid through the said tubes and beneath the said hoods,and a suction connection forv drawing voff evaporated cooling fluid fromthe said shell, substantially as set.

chambers, a hoodformed of a pair of bafile plates positioned withinsaidA shell, said plates being secured at their ends to the inner sidesof the end plates on the shell, the hood having a plurality of saidtubes positioned beneath it, a sec-l ond similar hood similarly placedwithin the shell and above the first named hood, each of Said hoodshaving an opening at their upper sides to permit free circulation of acooling fluid through the shell and a plurality of fluid nozzlespositioned in the .walls of the shell and directed so as to delivercooling fluid through 'the said tubes and beneath the said hoods, and asuction connection for drawing off evaporated cooling fluid from thesaid shell, said suction connection comprising a manifold positionedlongitudinally of the shell and having openingsz in its upper side forthe entry of evaporatedA cooling fluid, substantially as set forth.

ALVIN H. BAER.

